"led ultimately to the discovery that the equinox preceded about 2160 years in each sign or 25,920 years in the 12 signs, and this induced them to try if they could not form a cycle of the two. On examination, they found that the 600 would not commensurate the 2160 years in a sign, or any number of sums of 2160 less than ten, but that it would with ten, or that in ten times 2160, or in 21,600 years, the two cycles would agree; yet this artificial cycle would not be enough to include the cycle of 25,920. They, therefore, took two of the periods of 21,600, or 43,200; and, multiplying both by ten--viz: 600 X 10 = 6000, and 43,200 X 10 = 432,000--they formed a period with which the 600-year period and the 6000-year period would terminate and form a cycle. Every 432,000 years the three periods would commence anew; thus the three formed a year or cycle, 72 times 6000 making 432,000, and 720 times 600 making 432,000."(63) 63) Higgins, Anacalypsis, p. 235. To form a great year, which would include all the cyclical motions of the sun and moon, and perhaps of the planets, they multiplied 432,000 by ten; thus they had ten periods answering to ten signs. Concerning these cycles Godfrey Higgins observes: "Persons of narrow minds will be astonished at such monstrous cycles; but it is very certain that no period could properly be called the great year unless it embraced in its cycle every periodical movement or apparent aberration. But their vulgar wonder will perhaps cease when they are told that La Place has proved that, if the periodical aberrations of the moon be correctly calculated, the great year must be extended to a greater length even than 4,320,000 years of the Maha Yug of the Hindoos, and certainly no period can be called a year of our planetary system which does not take in all the periodical motions of the planetary bodies." It is thought that as soon as these ancient astronomers perceived that the equinoxes preceded, they would at once attempt to determine the rate of precession in a given time; the precession, however, in one year was so small that they were obliged to extend their observations over immense periods. Jones informs us that the Hindoos first supposed that the precession took place at the rate of 60 years in a degree, or 1800 in a Zodiacal sign, and of 21,600 in a revolution of the entire circle. They afterwards came to think that the precession was at the rate of 60 years and a fraction of a year, and thus that the precession for a sign was in 1824 years, and for the circle in 21,888 years. Subsequently they discovered, or thought they had discovered, the Soli-Lunar period of 608 years, hence they attempted to make the two go together. Both, however, proved to be erroneous. In referring to the fact that among the ancient Romans existed the story of the twelve vultures and the twelve ages of 120 years each, Higgins remarks: